The best hand recognition / tracking solution available for the 400 Series cameras is commercial body tracking software called Nuitrack SDK, as a built-in hand recognition system was not created for the current RealSense SDK, unlike the past 2016 version. Nuitrack is available for $39.99 a year, and there is also a free trial version.
https://nuitrack.com/
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BTW, the RealSense forum has now moved to a new site, so please post future questions there so that Intel support team members can assist you. Thanks!
https://support.intelrealsense.com/hc/en-us/community/topics
